Match the following:
I)pulley    p)always changes direction of application of force
II)class I lever q) vr always greater than 1
III) class II lever r) vr always less than 1
IV) class III lever s) lever
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Match the following:
I)pulley    p)always changes direction of application of force
II)class I lever q) vr always greater than 1
III) class II lever r) vr always less than 1
IV) class III lever s) lever